Added github workflow intent

.github/workflows/cron.yaml

@@ -0,0 +1,21 @@
+name: Cron actions
+
+on:
+  schedule:
+    - cron:  '0 0 * * *'
+
+jobs:
+  validate:
+    runs-on: "ubuntu-latest"
+    name: Validate
+    steps:
+        - uses: "actions/checkout@v2"
+
+        - name: HACS validation
+          uses: "hacs/action@main"
+          with:
+            category: "integration"
+            ignore: brands
+
+        - name: Hassfest validation
+          uses: "home-assistant/actions/hassfest@master"